Jim wrote: > I like to use watt-hours per mile as it gives a more accurate measure of > efficiency, but then I'm detail oriented.
Yes, Wh/mi is a sensible way to measure EV energy use, though mi/kWh is probably an easier way to express it for those used to mi/gal fuel consumption values (mi/kWh and mi/gal both express energy use in terms of how far one can travel on a certain amount of energy, and this makes it easier, I think, for people to get the point once they substitute the $ cost of a gallon of fuel or kWh of electricity into the expression ;^) > One of my EV's gets 426 whr per mile and another gets 185. One of the issues with Wh/mi or mi/kWh is that the value might be measured at the AC outlet or from the battery, and this can lead to confusion when comparing values from one source to those from another. >From an operating cost perspective, it is the Wh/mi or mi/kWh from the AC >outlet that people need to appreciate the difference in EV and ICE operating >costs. > It's no harder > to calculate than saying 2.35 miles per Kw or 5.4 miles per Kw. You need to be careful with units mi per kW is meaningless; the ICE equivalent is mi per hp. It is mi per kWh that makes sense. > Everyone knows what gasoline costs per gallon but few ICE drivers know > what they pay per KWH for electricity. It certainly gets some of them > to thinking after they get to the "Wow" part of the conversation when > educating someone on the economics of driving electric. > > Jim - Glendale, AZ (where electricity is 4.125 cents per Kw after 9pm) (where I'm sure electricity is actually priced by the kWh at all times of day ;^) Cheers, Roger. _______________________________________________ UNSUBSCRIBE: http://www.evdl.org/help/index.html#usub http://lists.evdl.org/listinfo.cgi/ev-evdl.org For EV drag racing discussion, please use NEDRA (http://groups.yahoo.com/group/NEDRA)
